open-vm-tools could not be building anymore with glibc 2.28. The bug is fixing in the upstream, and a version bump solves the issue. Patch: https://github.com/home-assistant/hassos/blob/fix-glibc/buildroot-patches/0012-openvmtools-bump-version-to-10.3.5.patch
Fixed by https://git.buildroot.org/buildroot/commit/?id=5f0f0f7e4f3362a3695d5876d0f41125a2544285 - Thanks